diff --git a/htdocs/core/class/html.form.class.php b/htdocs/core/class/html.form.class.php
index f31cb0f741e..71673aca078 100644
--- a/htdocs/core/class/html.form.class.php
+++ b/htdocs/core/class/html.form.class.php
@@ -823,11 +823,13 @@ class Form
      *	@param	string	$showfunction   Add function into label
      *	@param	string	$moreclass		Add more class to class style
      *	@param	string	$showsoc	    Add company into label
+     * 	@param	int		$forcecombo		Force to use combo box
+     *  @param	array	$event			Event options. Example: array(array('method'=>'getContacts', 'url'=>dol_buildpath('/core/ajax/contacts.php',1), 'htmlname'=>'contactid', 'params'=>array('add-customer-contact'=>'disabled')))
      *	@return	int						<0 if KO, Nb of contact in list if OK
      */
-    function select_contacts($socid,$selected='',$htmlname='contactid',$showempty=0,$exclude='',$limitto='',$showfunction=0, $moreclass='', $showsoc=0)
+    function select_contacts($socid,$selected='',$htmlname='contactid',$showempty=0,$exclude='',$limitto='',$showfunction=0, $moreclass='', $showsoc=0, $forcecombo=0, $event=array())
     {
-    	print $this->selectcontacts($socid,$selected,$htmlname,$showempty,$exclude,$limitto,$showfunction, $moreclass, $showsoc);
+    	print $this->selectcontacts($socid,$selected,$htmlname,$showempty,$exclude,$limitto,$showfunction, $moreclass, $showsoc, $forcecombo, $event);
     	return $this->num;
     }
 
@@ -844,9 +846,11 @@ class Form
      *	@param	string	$moreclass		Add more class to class style
      *	@param	bool	$options_only	Return options only (for ajax treatment)
      *	@param	string	$showsoc	    Add company into label
+     * 	@param	int		$forcecombo		Force to use combo box
+     *  @param	array	$event			Event options. Example: array(array('method'=>'getContacts', 'url'=>dol_buildpath('/core/ajax/contacts.php',1), 'htmlname'=>'contactid', 'params'=>array('add-customer-contact'=>'disabled')))
      *	@return	 int						<0 if KO, Nb of contact in list if OK
      */
-    function selectcontacts($socid,$selected='',$htmlname='contactid',$showempty=0,$exclude='',$limitto='',$showfunction=0, $moreclass='', $options_only=false, $showsoc=0)
+    function selectcontacts($socid,$selected='',$htmlname='contactid',$showempty=0,$exclude='',$limitto='',$showfunction=0, $moreclass='', $options_only=false, $showsoc=0, $forcecombo=0, $event=array())
     {
         global $conf,$langs;
 
@@ -872,6 +876,11 @@ class Form
         if ($resql)
         {
             $num=$this->db->num_rows($resql);
+            
+            if ($conf->use_javascript_ajax && $conf->global->CONTACT_USE_SEARCH_TO_SELECT && ! $forcecombo)
+            {
+            	$out.= ajax_combobox($htmlname, $event);
+            }
 
             if ($htmlname != 'none' || $options_only) $out.= '<select class="flat'.($moreclass?' '.$moreclass:'').'" id="'.$htmlname.'" name="'.$htmlname.'">';
             if ($showempty == 1) $out.= '<option value="0"'.($selected=='0'?' selected="selected"':'').'></option>';
diff --git a/htdocs/langs/en_US/admin.lang b/htdocs/langs/en_US/admin.lang
index 0fafedaf2b0..42924eb253f 100644
--- a/htdocs/langs/en_US/admin.lang
+++ b/htdocs/langs/en_US/admin.lang
@@ -50,6 +50,7 @@ DisableJavascript=Disable JavaScript and Ajax functions
 ConfirmAjax=Use Ajax confirmation popups
 UseSearchToSelectCompany=Use autocompletion fields to choose third parties (instead of using a list box).<br><br>Also if you have a large number of third parties (> 100 000), you can increase speed by setting constant SOCIETE_DONOTSEARCH_ANYWHERE to 1 in Setup->Other. Search will then be limited to start of string.
 ActivityStateToSelectCompany= Add a filter option to show/hide thirdparties which are currently in activity or has ceased it
+UseSearchToSelectContact=Use autocompletion fields to choose contact (instead of using a list box).<br><br>Also if you have a large number of third parties (> 100 000), you can increase speed by setting constant CONTACT_DONOTSEARCH_ANYWHERE to 1 in Setup->Other. Search will then be limited to start of string.
 SearchFilter=Search filters options
 NumberOfKeyToSearch=Nbr of characters to trigger search: %s
 ViewFullDateActions=Show full dates events in the third sheet
diff --git a/htdocs/langs/fr_FR/admin.lang b/htdocs/langs/fr_FR/admin.lang
index f9ffd05c060..3d0e9b1562b 100644
--- a/htdocs/langs/fr_FR/admin.lang
+++ b/htdocs/langs/fr_FR/admin.lang
@@ -49,6 +49,7 @@ DisableJavascript= Désactiver les fonctions Javascript et Ajax
 ConfirmAjax= Utiliser les popups de confirmation Ajax
 UseSearchToSelectCompany= Utiliser un champ avec autocomplétion pour choisir un tiers (plutôt qu'une liste déroulante).<br><br>Notez que si vous avez un nombre important de produits ou services (> 100 000), vous pouvez améliorer les performances en définissant la constante SOCIETE_DONOTSEARCH_ANYWHERE à 1 dans Configuration->Divers. La recherche sera alors limitée au début de la chaine.
 ActivityStateToSelectCompany= Ajouter une option de filtrage lors des recherches pour afficher/masquer les tiers en exercice ou ayant cessés d'exercer
+UseSearchToSelectContact= Utiliser un champ avec autocomplétion pour choisir un contact (plutôt qu'une liste déroulante).<br><br>Notez que si vous avez un nombre important de produits ou services (> 100 000), vous pouvez améliorer les performances en définissant la constante CONTACT_DONOTSEARCH_ANYWHERE à 1 dans Configuration->Divers. La recherche sera alors limitée au début de la chaine.
 SearchFilter=Options des filtres de recherche
 NumberOfKeyToSearch=Nb carac. déclenchant recherche: %s
 ViewFullDateActions= Visualiser les dates des actions en entier dans la fiche tiers
diff --git a/htdocs/societe/admin/societe.php b/htdocs/societe/admin/societe.php
index 3bb95dd10ee..1b0efa2c4b2 100644
--- a/htdocs/societe/admin/societe.php
+++ b/htdocs/societe/admin/societe.php
@@ -82,6 +82,21 @@ if ($action == 'COMPANY_USE_SEARCH_TO_SELECT')
 	}
 }
 
+if ($action == 'CONTACT_USE_SEARCH_TO_SELECT')
+{
+	$contactsearch = GETPOST('activate_CONTACT_USE_SEARCH_TO_SELECT','alpha');
+	$res = dolibarr_set_const($db, "CONTACT_USE_SEARCH_TO_SELECT", $contactsearch,'chaine',0,'',$conf->entity);
+	if (! $res > 0) $error++;
+	if (! $error)
+	{
+		$mesg = "<font class=\"ok\">".$langs->trans("SetupSaved")."</font>";
+	}
+	else
+	{
+		$mesg = "<font class=\"error\">".$langs->trans("Error")."</font>";
+	}
+}
+
 // Define constants for submodules that contains parameters (forms with param1, param2, ... and value1, value2, ...)
 if ($action == 'setModuleOptions')
 {
@@ -647,9 +662,37 @@ else
 print '</tr>';
 print '</form>';
 
+
+$var=!$var;
+print '<form method="POST" action="'.$_SERVER['PHP_SELF'].'">';
+print '<input type="hidden" name="token" value="'.$_SESSION['newtoken'].'">';
+print '<input type="hidden" name="action" value="CONTACT_USE_SEARCH_TO_SELECT">';
+print "<tr ".$bc[$var].">";
+print '<td width="80%">'.$langs->trans("UseSearchToSelectContact").'</td>';
+if (! $conf->use_javascript_ajax)
+{
+	print '<td nowrap="nowrap" align="right" colspan="2">';
+	print $langs->trans("NotAvailableWhenAjaxDisabled");
+	print "</td>";
+}
+else
+{
+	print '<td width="60" align="right">';
+	$arrval=array('0'=>$langs->trans("No"),
+	'1'=>$langs->trans("Yes").' ('.$langs->trans("NumberOfKeyToSearch",1).')',
+	'2'=>$langs->trans("Yes").' ('.$langs->trans("NumberOfKeyToSearch",2).')',
+	'3'=>$langs->trans("Yes").' ('.$langs->trans("NumberOfKeyToSearch",3).')',
+	);
+	print $form->selectarray("activate_CONTACT_USE_SEARCH_TO_SELECT",$arrval,$conf->global->CONTACT_USE_SEARCH_TO_SELECT);
+	print '</td><td align="right">';
+	print '<input type="submit" class="button" value="'.$langs->trans("Modify").'">';
+	print "</td>";
+}
+print '</tr>';
 print '</table>';
 
 
+
 dol_fiche_end();
 
 $db->close();